JPH10144135A - Lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device which can set the lowering position of a hanging article as desired and accurately, in a small size and a simple structure. SOLUTION: A winding drum 15 to wind a cable 14 is rotated by a driving part 11. A spiral guide 25 is provided on the side surface of the winding drum 15. A moving part 37 engaged movable along the guide 25 is supported movable along the diameter direction of the guide 25 by a support body 31. Furthermore, a stopping means 40 to stop the driving part 11 by detecting the moving part 37 to move to a specific position corresponding to the rotation of the guide 25, in the delivering condition of the cable 14 by the rotation of the winding drum 15, is provided. And this stopping means 40 is installed to the support body 31 allowable to regulate the position along the moving direction of the moving part 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for lifting a suspended object suspended by a cable.

[0002]

2. Description of the Related Art Conventionally, for example, in a lighting fixture installed at a high place such as a high ceiling, the lighting fixture is raised and lowered in order to easily perform maintenance of the lighting fixture near a floor surface. The device is used.

In this elevating device, a wire rope in which a lighting device is hung is wound around a winding drum, and the winding drum is rotated by a motor to feed or wind the wire rope, thereby forming the lighting device. I try to lower or raise. In such a lifting device, usually,
When the lighting device is lowered by pulling out the wire rope from the winding drum by driving the motor, an automatic stop function that detects the slack of the wire rope when the lighting device reaches the floor surface and stops the motor is provided. Have.

[0004] However, such an automatic stop function for detecting the slack of the wire rope and stopping the motor has a problem.
It is not suitable for decorative lighting fixtures such as chandeliers. That is, for example, in the case of a highly decorative chandelier using glass pipes, beads or chains, even when the tip reaches the ground, the cable does not loosen, and the chandelier continues to descend as it is, and the chandelier may be damaged. have. Therefore, in order to use the elevating device for a lighting fixture such as a chandelier, a function of stopping the lighting fixture before it reaches the floor is required.

Conventionally, when a lifting device is used for a chandelier-type lighting device, for example, as described in Japanese Utility Model Publication No. 3-30966, a lifting device having a function of setting a lifting height is used. Alternatively, an elevating device in which the length of the wire rope is adjusted in advance so that the lighting device does not reach the floor surface is used, or an elevating device with a timer function for stopping the descent after a predetermined time from the start of descent of the lighting device is used. In any of these cases, the lighting fixture is set to stop descending before it reaches the floor so that the lighting fixture is not damaged.

[0006]

However, the lifting and lowering device described in Japanese Utility Model Publication No. 3-30966 has a problem that the lifting and lowering device becomes large by the amount of the motion transmitting means.
In addition, there is a problem of delivery date and a problem that cannot be fine-tuned at the construction site because the lifting device with the length of the wire rope is a special order, or a lifting device with a timer mechanism after a predetermined time set by the timer Even when the lowering of the lighting fixture is stopped, there is a problem that the lowering position where the lighting fixture actually descends varies.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an elevating device capable of arbitrarily and accurately setting a descent position of a suspended object with a small and simple structure.

[0008]

A lifting device according to the present invention comprises a winding drum for winding a rope on which a suspended object is suspended, a driving unit for rotating the winding drum, and an integral unit with the winding drum. And a guide portion spirally provided in the direction of rotation of the winding drum, a moving portion engaging with the guide portion, and supporting the moving portion movably along the radial direction of the guide portion. A support, mounted on the support so as to be position-adjustable along the moving direction of the moving section, and moves to a predetermined position corresponding to the rotation of the guide section when the rope is extended by rotation of the winding drum. Stopping means for detecting the moving part and stopping the driving part.

[0009] The winding unit is rotated forward and reverse by the drive unit, and the rope is paid out or taken up to lower or raise the suspended object. The spiral guide rotates integrally with the take-up drum, and the moving portion supported by the support moves along with the guide in the radial direction of the guide. The moving position of the moving unit corresponds to the number of rotations of the guide unit and the winding drum, and also corresponds to the amount by which the cable is extended, that is, the descending position of the suspended object. Therefore, if the position where the stopping means detects the moving part is adjusted, when the suspended object reaches an arbitrary descending position, the moving part is detected by the stopping means and the driving part is stopped, and the suspended object is accurately detected. Stop at the lowered position.

The stopping means includes a switch for opening and closing a power supply circuit of the drive unit, and also opens and closes a power supply circuit of the drive unit based on a detection unit such as a sensor for detecting a moving unit and a detection signal of the detection unit. And a control unit for stopping and controlling the drive unit based on the detection signal of the switch or the detection unit.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lifting device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a lifting device, FIG. 2 is a perspective view of a part of the lifting device in an exploded state, FIG. 3 is a front view of a part of the lifting device, and FIG. 4 is a side view of a part of the lifting device. Fig. 5 (a) is a front view of the suspended object being lifted, Fig. 5 (b) is a front view of a part of the lifting device when the suspended object is raised, and Fig. 6 (a) is a front view of the suspended object being lowered. FIG. 6 (b) is a front view of a part of the lifting device when the suspended object is lowered.

In FIG. 1, reference numeral 1 denotes a lifting / lowering apparatus main body, and the lifting / lowering apparatus main body 1 has a housing 2 fixedly installed on a high ceiling or the like. A circular opening 3 is formed on the lower surface of the housing 2.

A motor 12 and a speed reducer 13 constituting a drive unit 11 are mounted inside the lifting device main body 1.
A take-up drum 15 for winding a wire rope 14 as a cable is attached to an output shaft 13a (shown in FIG. 2 described later) of the speed reducer 13. The tip of the wire rope 14 unreeled from the winding drum 15 is changed in direction by a plurality of pulleys 16 and 17 and is led downward from the opening 3 of the housing 2 to be raised and lowered.
After passing through 18, it is introduced into the inside of the housing 2 from the opening 3 and is fixedly supported. Wire rope 14
A pulley (not shown) around which is mounted is rotatably mounted.

2 to 4, the winding drum 15
A cylindrical winding body 21 around which the wire rope 14 is wound, and disk-shaped flanges 22 formed at both ends of the winding body 21;
A winding space 24 for winding the wire rope 14 is formed in a space surrounded by the winding body 21 and the flanges 22 and 23, and the center of the winding body 21 is It is fixedly attached to the output shaft 13a.

A flange portion of the winding drum 15 on the side opposite to the speed reducer 13
23 has a spiral groove 25 as a spiral guide.
Are formed. The spiral shape of the spiral groove 25 is formed so as to gradually increase in diameter from the center side to the outer diameter side in accordance with the winding direction of the wire rope 14 of the winding drum 15, and is wound around the winding drum 15. The number of turns is greater than the number of turns of the wire rope 14 to be taken.

A support 31 is attached to the speed reducer 13. The support 31 is provided with a wire rope 14 which is wound up and fed out in close proximity to and above the flanges 22, 23 of the winding drum 15. Has a guide plate portion 32 for preventing it from coming off the flange portions 22 and 23, and is bent downward from the tip of the guide plate portion 32 to face the outer surface of the flange portion 23 of the winding drum 15 almost in parallel. A support plate 33 is formed. A long hole 34 is formed in the support plate portion 33 along the radial direction of the spiral groove 25, that is, vertically below the center of the winding drum 15 along the vertical direction. A pair of long holes 35 and 36 long in the vertical direction are formed adjacent to each other in parallel. At the edge of the elongated hole 35, a scale 35a is displayed as a guide for a mounting position of a microswitch described later.

A pin 37 as a moving portion is movably inserted into and engaged with the elongated hole 34 of the support plate portion 33 of the support 31.
Are inserted and engaged with the spiral groove 25. A flange portion 38 is formed at an intermediate portion of the pin 37, and a coil spring 39 is interposed between the flange portion 38 and the support 31 to
The tip of 37 is urged in a direction to engage with the spiral groove 25.

On the outer surface of the support plate 33 of the support 31, a microswitch 40 as a stopping means is arranged. The microswitch 40 has a switch body 41 and a detection lever 42 protruding from the lower surface of the switch body 41 to the side so as to be vertically swingable.

The microswitch 40 is mounted on a mounting plate 43 by screws 44. The mounting plate 43 has an insertion hole 45 facing the elongated hole 35 and an engagement piece movably engaged with the elongated hole 36. A part 46 is formed. A locking pin 47 having a substantially L-shaped tip at the insertion hole 45 of the mounting plate 43.
Are inserted and engaged, and the attachment and detachment of the mounting plate 43 and the movement along the long holes 35 and 36 are allowed with the tip of the locking pin 47 being parallel to the long hole 35, and the locking pin 47 is turned approximately 45 °. The mounting plate 43 is locked to the support 31 by moving the tip of the locking pin 47 to engage with the rear surface of the edge of the elongated hole 35.

An operation panel (not shown) is provided with an ascending switch and a descending switch. There are two feeding circuits for ascending and descending the motor 12 which are closed by the ascending and descending switches. Micro switch 40
It is wired in the power supply circuit for lowering, turns on when the detection lever 42 is swinging downward, and allows current to the motor 12, and turns off when the detection lever 42 is pushed upward and turns off.
Turn off power to 12. In addition, the power circuit for ascending
A limit switch (not shown) for turning off the power supply circuit at a position where the lifting / lowering unit 18 is at the highest position is wired. This limit switch is attached to the lifting device main body 1 side.

As shown in FIGS. 5 and 6, for example, a chandelier-shaped lighting fixture 51 as a suspended object is attached to the elevating section 18. As shown in FIG.

Next, the operation of the present embodiment will be described.

As shown in FIG. 5, when the lighting fixture 51 is raised, most of the wire rope 14 is wound on the winding drum.
The take-up drum 15 is wound, and the pin 37 is engaged with the outer diameter side of the spiral groove 25 of the take-up drum 15, and the pin 37 is located below the long hole 34 of the support 31. When the detection lever 42 of the micro switch 40 moves downward,
40 is in the ON state, and the motor is
Power to 12 is allowed.

When the lowering switch of the operation panel is operated to lower the luminaire 51, the power supply circuit for lowering is closed, the motor 12 is rotated, and the wire rope 14 is paid out from the winding drum 15, Lighting equipment 51 with lifting part 18
Is lowered. When the winding drum 15 is rotated, the pin 37 engaged with the spiral groove 25 of the winding drum 15
The pin 37 is gradually moved from the outer diameter side to the center side, and the pin 37 is moved upward in the long hole 34 of the support 31.

As shown in FIG. 6, when the luminaire 51 is lowered close to the floor surface 52, the detection lever 42 of the micro switch 40 is pushed up by the pin 37, and the micro switch 40 is turned off. The circuit is opened, the motor 12 is stopped, and the lowering of the lighting fixture 51 is stopped.

The position of movement of the pin 37 in the elongated hole 34 of the support 31 corresponds to the number of rotations of the winding drum 15, that is, the spiral groove 25, and the amount of extension of the wire rope 14, that is, the lowering position of the lighting fixture 51. Corresponding. Therefore, by adjusting the mounting position of the microswitch 40 with respect to the support 31 via the mounting plate 43 which moves along the long holes 35 and 36, that is, the position where the microswitch 40 is turned off by the pin 37 is adjusted. By doing so, when the lighting fixture 51 reaches an arbitrary lowering position, the micro switch 40 is turned off by the pin 37 to stop the motor 12, and the lighting fixture 51 can be stopped at the accurate lowering position.

When the raising switch on the operation panel is operated to raise the lighting equipment 51, the power supply circuit for lifting is closed, the motor 12 is rotated in the reverse direction, and the wire rope 14 is wound around the winding drum 15. As a result, the lighting device 51 is raised together with the lifting unit 18. When the winding drum 15 is rotated, the winding drum
The pin 37 engaged with the 15 spiral grooves 25 is gradually moved from the center side of the spiral groove 25 to the outer diameter side, and the pin 37 is moved down in the long hole 34 of the support 31.

When the pin 37 is moved downward in the long hole 34 of the support 31, the push-up of the detection lever 42 of the microswitch 40 is released, the microswitch 40 is turned on, and the motor 12 is turned on in the power supply circuit for lowering. Is allowed.

When the lighting equipment 51 is raised to a predetermined height, a limit switch (not shown) is pushed by the elevating unit 18, the power supply circuit for lifting is opened, the motor 12 is stopped, and the lighting equipment 51 is lifted. Stopped.

As described above, the movement position of the pin 37 corresponds to the rotation speed of the winding drum 15, that is, the spiral groove 25, and also corresponds to the extension amount of the wire rope 14, that is, the lowered position of the lighting equipment 51. If the position where is turned off by the pin 37 is adjusted, when the lighting fixture 51 reaches an arbitrary lowering position, the micro switch 40 is turned off by the pin 37 to stop the motor 12 and stop the lowering of the lighting fixture 51. Lighting equipment with a small and simple configuration
The descending position of 51 can be set arbitrarily and accurately.

The guide portion is not limited to the groove shape, but may be a ridge, and is not limited to being formed on the flange portion 23 of the winding drum 15. Alternatively, it may be formed to rotate integrally with the winding drum 15.

The stopping means includes a microswitch 40 for opening and closing the power supply circuit for lowering the motor 12, and a detecting unit such as a sensor for detecting the pin 37 and the motor 12 based on a detection signal of the detecting unit. And a control unit for stopping and controlling the motor 12 based on a detection signal of the detection unit.

[0034]

According to the elevating device of the present invention, the spiral guide rotates integrally with the winding drum, and the moving part which is engaged with the guide and supported by the support has the diameter of the guide. The moving position of the moving unit corresponds to the number of rotations of the guide unit and the winding drum, and also corresponds to the amount of the rope extended, that is, the lowered position of the suspended object. If the suspended object reaches an arbitrary descending position, the moving unit can be detected by the stopping means and the driving unit can be stopped to stop the descending of the suspended object. With a simple configuration, the descending position of the suspended object can be set arbitrarily and accurately.

[Brief description of the drawings]

FIG. 1 is a perspective view of an elevating device showing an embodiment of the present invention.

FIG. 2 is a perspective view of a part of the lifting device in an exploded state.

FIG. 3 is a front view of a part of the lifting device.

FIG. 4 is a side view of a part of the lifting device.

FIG. 5 shows the lifting state of the suspended object of the lifting device, and (a)
FIG. 2 is a front view of the suspended object in a rising state, and FIG.

FIG. 6 shows a lowered state of a suspended object of the lifting device, and (a)
FIG. 2 is a front view of the suspended object in a lowered state, and FIG. 2B is a front view of a part of the lifting device when the suspended object is lowered.

[Explanation of symbols]

 11 Drive unit 14 Wire rope as a cable 15 Winding drum 25 Spiral groove as a guide 31 Support 37 Pin as a moving unit 40 Microswitch as a stopping means

Claims (1)

[Claims] 1. A winding drum for winding a rope on which a suspended object is suspended, a driving unit for rotating the winding drum, and a rotation direction of the winding drum which is integrally rotated with the winding drum. A guide portion provided in a spiral shape, a moving portion engaged with the guide portion, a support member movably supporting the moving portion along a radial direction of the guide portion, and a moving portion provided on the support member. Is mounted so as to be adjustable along the direction of movement of the guide drum, and detects a moving unit that moves to a predetermined position in response to the rotation of the guide unit when the rope is extended by rotation of the winding drum, and stops the driving unit. An elevating device comprising a stopping means.